Rated 3 out of 5 stars

A good concept, and works well when it works, although it causes links that normally open in another tab (at least in Google search results) to open in the same tab, with no option to avoid this behavior.

However, around 1/3 of the time, when starting Firefox, the extension does not function, and the toolbar icon is missing, although the add-ons manager says the extension is enabled. That's not good.